Internal Medicine

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Venous Embolism and Thrombosis

Blood clots (venous embolism and thrombosis) in a vein are more commonly seen in the lower extremities and pelvis. They are usually caused by prolonged inactivity, insertion of an intravenous catheter, or having a condition that causes clots to form more easily. They occur more frequently after an operation. Sometimes a clot breaks off, forming an embolus, which travels through the veins, usually getting stuck in the lungs.